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16
TROUBLESHOOTING
If the air handler fails to operate, check the following:
• Istheelectricturnedon?
• Isthethermostatoperatingproperly?
• Aretheblowercompartmentdoor(s)inplace?
• Istheairhandlerdisconnectclosed?
• Hasthecircuitbreakertrippedorthecontrolboardfuse
burnedopen?
• Areanymanualresetswitchesopen?
• Isthelterdirtyorplugged?
• IstheLEDonbothcontrolboardsconstantlyON?If
not, refer to Tables 3 or 4 to determine fault condition.
RED LED (AN2) DIAGNOSTIC
OFF Control Fault (No Power)
Flash Blower Fault
ON Normal Operation
Table 3. Air handler Control Board Fault Conditions
FURNACE SIZE (BTUH) FILTER SIZE
24K & 30K 12 x 20 x 1
36K & 42K 18 x 20 x 1
48K & 60K 20 x 20 x 1
Table 2. Filter Sizes
UNIT MAINTENANCE
Proper maintenance is most important to achieve the best
performance from a air handler. Some of the components
and their locations are shown in Figure 13 (page 18). If
any component of the air handler must be replaced, use
only factory authorized replacement parts specified in the
Replacement Parts List provided online.
WARNING:
ELECTRICAL SHOCK, FIRE OR EXPLOSION
HAZARD
Failure to follow safety warnings exactly could
result in serious injury or property damage.
Improper servicing could result in dangerous
operation, serious injury, death or property
damage.
•Beforeservicing,disconnectallelectricalpower
to air handler.
•Whenservicingcontrols,labelallwiresprior
to disconnecting. Reconnect wires correctly.
•Verifyproperoperationafterservicing.
• Thesemaintenanceinstructionsareprimarilyintended
to assist qualified technicians experienced in the proper
maintenance and operation of this appliance.
• Always reinstall the doors on the air handler after
servicing or cleaning/changing the filters. Do not operate
the air handler without all doors and covers in place.
• Verifythatthethermostatisproperlyinstalledandis
not being affected by drafts or heat from lamps or other
appliances.
• To achieve the best performance and minimize
equipment failure, it is recommended that a yearly
maintenance checkup be performed. At a minimum,
this check should include the following items:
Air Filter(s)
HMG**F1E, HMG**X1E & HCG**V1E series air handlers
are not supplied with a single air filter when shipped from
the factory. It is recommended that the filter be cleaned
or replaced monthly. Newly built or recently renovated
homes may require more frequent changing until the
construction dust has minimized. Filter sizes shown in
Table 2 are available at most local retailers.
WARNING:
Never operate the air handler without a filter in
place. Dust and lint in the return air can build
up on internal components, resulting in loss of
efficiency, equipment damage, and possible fire.
Filters designed to remove smaller particles such as
pollen, may require additional maintenance.
Blower Compartment
Dirt and lint can create excessive loads on the motor
resulting in higher than normal operating temperatures
and shortened service life. It is recommended that the
blower compartment be cleaned of dirt or lint that may
have accumulated in the compartment or on the blower
and motor as part of the annual inspection.
Blower Fan Wheel
Inspect the blower wheel blades for accumulations of dirt
and clean if necessary. Inspect mounting nut for tightness
when done.
Blower Motor & Assembly
Inspect the blower assembly and motor mounting
brackets for tightness and corrosion. Correct deficiencies
if necessary. The blower motor contains sealed bearings
and under normal operating conditions, no maintenance
is necessary for the life of the equipment.
Table 4. Motor Control Board Fault Conditions
DIAGNOSTIC
GREEN
LED
RED
LED
Fixed
Speed
Furnaces
Control Fault (No Power) Off Off
Normal Operation On On
Motor Fault On Flash
Twin Fault (no motor fault) Flash On
Communications Fault Flash Flash
Variable
Speed
Furnaces
Control Fault (No Power) Off Off
Normal Operation On On
Motor Fault On Flash
Communications Fault Flash Flash